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SAE AMS 2175 Document Information:
Title
Castings, Classification and Inspection of
SAE International
Publication Date:
Jul 20, 2003
Scope:
Purpose:
This specification establishes nondestructive testing methods,
sampling frequency, and acceptance
criteria for the inspection of metal castings.
Application:
This specification has been used typically for structural castings,
but usage is not limited to
such applications.
Casting Methods: This specification is intended to apply to all
casting methods except high
pressure die castings (see 8.3).
Casting Alloys: This specification is intended to apply to all casting
alloys covered in Tables 6
through 14. Other alloys may be inspected to this standard as
described in 3.4.3.2 using criteria
specified by the cognizant engineering organization.
Classification:
Castings that are inspected in accordance with this specification are
designated by classes and
applicable grades. The "Casting Class" governs the frequency of
inspection (see 3.1 and 4.3), while
the "Casting Grade" controls the acceptance criteria (see 3.1 and
3.4).
Classes:
Class 1 - A casting, the single failure of which would endanger the
lives of operating personnel,
or cause the loss of a missile, aircraft, or other vehicle.
Class 2 - A casting, the single failure of which would result in a
significant operational penalty.
In the case of missiles, aircraft, and other vehicles, this includes
loss of major components,
unintentional release or inability to release armament stores, or
failure of weapon installation
components.
Class 3 - Castings not included in Class 1 or Class 2 and having a
margin of safety of 200 percent
or less.
Class 4 - Castings not included in Class 1 or Class 2 and having a
margin of safety greater than
200 percent.
Grades: Castings, or sections of a casting, shall be of the following
grades:
Grade A - The highest quality grade of casting, or area of a casting,
with minimum allowable
discontinuities and very difficult to produce except in local areas.
Grade B - The second highest quality grade of casting, or area of a
casting, which allows slightly
more discontinuities than Grade A, and difficult to produce, except in
local areas.
Grade C - A high quality grade of casting, or area of a casting, that
can be consistently produced.
Grade D - The lowest quality grade of a casting, or area of a casting,
that is easily produced and
is used primarily for low stress or noncritical areas adjacent to the
higher graded areas.
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